A power conversion system for power supply and distribution of long-distance and multi-interval equipment

Abstract

The invention proposes a power conversion system for power supply and distribution of long-distance and multi-interval equipment, which is suitable for highway equipment, long-distance lighting, national defense monitoring and other occasions. The system is mainly composed of source power conversion equipment and remote power distribution Transform device composition. Wherein, the source-side power supply conversion equipment includes a source-side power supply converter and a source-side boost conversion device. The source-side power supply converter is used to convert three-phase mains power into single-phase 50Hz AC power. The source-side step-up conversion device is used to boost the output voltage of the power supply converter to 700V~1000V / ac, and transmit the electric energy to the remote equipment at this voltage level. The remote power distribution and conversion equipment includes a remote step-down conversion device and a remote precise voltage regulator converter. The step-down conversion device converts the high-voltage power of the main line to the voltage input range that the power distribution converter can withstand, and then converts it through the remote precise voltage regulator converter to output accurate 220V, 50Hz AC power for remote electrical equipment use.

Description

technical field [0001] The invention relates to the fields of power electronic conversion and power supply and distribution, in particular to a power conversion system suitable for power supply and distribution of long-distance and multi-interval equipment. Background technique [0002] With the transformation of infrastructure such as highways, it is necessary to expand the capacity of the original electrical equipment or add new high-power electrical equipment, for example, to add monitoring equipment or road signs at regular intervals. At present, the power supply and distribution schemes applied to long-distance power consumption equipment mainly include: [0003] (1) Nearby power distribution, that is: take power from the place closest to the electrical equipment, and the voltage level is 220V. [0004] (2) Power distribution from the source side, that is: firstly, the mains power is boosted and converted into high-voltage power, and after being transmitted to the subs...

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Problems solved by technology

[0007] The (1) power supply and distribution method is the simplest. It takes power directly from the nearby places of the electrical equipment, thus eliminating the need for power conversion. However, its shortcoming is that the power distribution distance is limited. Due to the influence of voltage drop, the voltage level reaching the equipment end may not meet the requirements of the electrical equipment

At the same time, this method is easy to cause the cable to be stolen

[0008] The (2) power supply and distribution method can distribute electric energy to a long distance by boosting the voltage at the source end. At the same time, passive equipment is used for energy conversion, so the operation is stable, but its problem is that it uses a voltage stabilizer to stabilize the power supply. The voltage is easily affected by the power grid, and at the same time, the load capacity is weak, and when it supplies power to kilowatt-level electrical equipment, it will generate serious heat

[0009] (3) The constant current form of power distribution can control the transmission loss on the cable to keep constant, but under the condition of high power operation, the control method is complicated and the system stability is not high

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